Derrick



Apr. m, wm y mgm H. H. H. Il-IAWML ATTORNEY iiiatented Apr. Z4, 1923 entran stares lattihltlt nannten.

Application filed August 3l, 1920.

.To @ZZ/m7211147@ t may; eminem.'

Be it known that l, l-L-iNs H. H. l-lAnKLow,

`a citizen oit the United States, residingat `and guy derriclrs, andthe principal `object 1s to provide a device ofthis nature in which a wooden and steelderriclr may be constructed in sections.

` Another object is to provide an `improved 15` Another `object is to render the sheaves atthe bot-tom oji the mast, readily accessible. `Other objects will appear from the tolM lowing description and claims. fill of these i 30 objects are attained by the means shownin the accompanyinpr drawingcomprising` two sheets, in which i Figure 1 is an elevation proved derrick. Figure 2 is a fragmentary detail view illustratinothe manner ot splicingv the `memview o'l my im- `bers ot the derrick Figure 3 is a sectional view taken substantially on lineS-S ot Figure l.

\ Figure 4C is a vertical sectional view through the mast step.

n Figure 5 is a plan view ot the mast step. Figure G is a vertical sectional view taken substantially along line (3-6 ot Figure 4h Like characters ot reference reter to .like

parts in all views.

Heretofore "wooden derricks have been made with the mast, brace, boom and sill each in a single piece and have caused considerable Vtrouble in moving `from place to place on account of their size and weight. Derriclrs are transported from one place to another in the city on what are known as reach trucks and it the members are excessively long the rear wheels may skid and cause the timbers to swing into a building `similar parts of the mast.

Serial No. 407,140.

or the lilre when it is attempted to turn a corner. ln transportation upon the railroads:` the length of the members has often required two or three flat cars to be used for transportation. Furthermore there has been great waste and inconvenience in replacing broken parts. It is the purpose of `this invention to construct a wooden derrick in sections so that the same may be easily loaded upon an ordinary wagon or `placed in box cars and any `one oifY the parts of which may be readily and economically rei placed in case ot damage. The other purpose ot the present invention is to place the derriclr in a mechanical control so as to do away with the bull-wheel which is now in use and 'to avoid placing the lives ot operators in jeopardy by the use oit tag' ropes.

llieiierrinp;` more particularly to the drawings, l represents the sections of the sills of a derrick embodying my invention, 2 represents `similar parts of the braces and 3 The sections in each case are spliced together as will be presently specifically described so as to form rin'd members. The upper end of the mast is providedwith a thrust ball-bearing at Lland upon this are mounted the goose-neck fittings 5 on both oi the braces, each brace being secured at its lower end to the respective sill by a brace itting,r (i. 7 and 8 represent topping.1 litt tackle blocks by means ot which the live boom is raised and lowered. Thisilive boom is composed ot several sections 9 which are spliced together in the same manner as the betere mentioned members. Tackle and hoisting blocks are shown at 10 and Il and the cooperating); cable 12 ot said blocks 10 and ll. passes over a sheave 13 in `one ciAl the members 9 end ,then down over a sheave let mounted on the mast. rlhe cable which cooperates with blocks 7 and 5% passes down over sheaves 16 and i7 as shown in Figure l., and in rear ot a shea-ve 14V mounted on the same rod as the sheave over which the ci ble 'l2 passes.

The manner of splicing; the various mem bers is fully shown in Figure 2., in which a, splice et the members 2is shown. '.lheinembers 2 abut against each other at 18 and are `cut away to tit into channel bars 1.9 and are bolted in place by bolts which pass through the channel members 19, the members 20 and through a spacer 2l. Filhen the member is to be subjected to compressingstress as jfor instance in the mast the members 21 are made sufficiently long to entirely lill the space between the side members of a splice.

The sheaves 14 are mounted between plates 22 as shown in Figure 3, which plates are secured to respective angle irons 2,3. Bolts 24 pass through angle irons 23, and the mast and through a plate 25 on the opposite side of the mast to secure the support in place.

In the present invention the mast is supported at its lower end in a chamber 26 formed in the mast step'27 and the boom is pivoted in a chamber 28 ofvsaid step. To the base of the member 27 is bolted or otherwise secured a member 29 having` on its periphery gear teeth 30 adapted to mesh with a gear pinion 31. A standard 32 carries a thrust ball bearingl 33 upon which the member 29 is seated. Member 29 is provided with a downwardly projecting portion 34 which fits into a 'socket'35 in the member 32, and is securedy therein by a plurality of bolts which have their inner ends entered in an annular groove 51 in 34. The member 32 is supportedV upon four I-beains 36 which are arranged in pairs. Mounted upon these I-beams is a stub shaft 37 upon which pinion 31 is secured, and to said shaft 37 is also secured aV gear 38 which may be operated from an electric motor or from any other source of power. The I-beams 36 are secured to the sills and the inner ones of these I-beams are provided as shown in Figures 5 and 6 with inwardly facing bearing blocks 39having bearings 40 for a rod upon which are pivoted sheaves 41 over which the cables 12 and 15 are passed on their way to the motor or engineY or any other source of power; The blocks 39 are held in place by flanges 42 and 43 and blocks 44. F lange 42 is formed on a member 45 and flange on a member 46 and both are held in place by bolts 47 which pass through the I-beams and co-act with sleeves 48 to hold said I-beams in spaced relation as shown in Figures 5 and 6. The block 44 is held in place by a bolt 49, and it will be obvious that if one of the sheaves 41 isv broken it may be readily replaced by merely removing the two bolts 49 and 4slipping the pivot blocks 39 out.

The I-beainsu 36 are held to the member 32 by means of' bolts Owhich pass through the apertures between the pairs of I-beams and clamp square plates 51 against the inner` faces of the upper flanges as shown in Figure 6.

It will be read-ily seen that every movement of theV derrick -is under mechanical control, and that by making the revolving mast step so compact the device can be .set in clos" to a building` wall for use. lt will also be noted that all parts are readily ace ssible and that by this construction the derrick may be quickly and easily transported from one place to another.

Vhile I have described what I deem to be the most desirable embodiment ol my invention, it is obvious that many of the details may be varied without in any way departingv from the spirit of my invention and I therefore do not limit myself to the exact details of construction herein set forth nor to anything less than the whole ol my invention limited only by the appended claims.

lVhat I claim as ne f' and desire to secure by Letters Patent is:-

l. In a device of the class described, the

combination of a plurality of beams secured together in pairs and in spaced relationship with each other, a socket member supported by said beams, a bearing supported by said socket member, a mast support rotatably Supported by said bearing and provided with an element adapted to project into the socket of said socket member., and mechanical means for driving said mast support.

2. In a device of the class described, the combination of a plurality of beams secured together in pairs and in spaced relationship with each other, a plurality of removable bearing blocks mounted on said beams, apivot rod' mounted in said blocks, and a sheave mounted on said rod.

3. In a device of the class described, the combination of a plurality of beams secured. together in pairs and in spaced relationship with each other, a plurality of removable bearing blocks mounted on said beams.r a pivot rod mounted in said blocks. a sheave on said rod, a. socketmember rigidly Supported by said beams. and a mast supporting member rotatably i'l'ioui'ited on said socket member.

4. In a device of the class described, the combination of a plurality of beams secured together in pairs and in spaced relationship with each other, a plurality ofremovable bearing blocks mounted on said beams, a pivot rod mounted in said blocks` a sheave on said rod. a socket n'lcinber rigidly supported by said beams. a mast supl'iorting member rotatably mounted on said socket member,

and means for rotating said mast. supporting4 member, and a mast supporting member ro tatably mounted on said socket.

In testimony whereof I have alixed my signature.

HANS Il, H. HARKLOW. 

